public class TeacherTest {

  public static void main(String[] args) {
    // 创建Teacher对象
    Teacher t = new Teacher();
    // 调用set方法赋值
    t.setName("张三");
    t.setAge(30);
    t.setSubject("Java");
    // 调用show方法输出属性
    t.show();
    // 通过全参构造器创建对象
    Teacher t1 = new Teacher("李四", 35, "Python");
    t1.show();
    // 通过单参构造器创建对象
    Teacher t2 = new Teacher("李四");
    t2.show();
  }
}